Our 16mm Incalmo, white core or White Hearts where we use an interior of white opaque glass with an exterior coating of our transparent Moretti glass. These can also be frosted for another great effect. They work with with our other opaque color beads. Note that the colors of the Rubino seem layered or striped in some cases. Rubino is worked with a cane which is crystal/rubino/crystal which creates this effect. Rubino, like our reds, is a difficult color and at times is darker than other times. The nature of this color and it's difficulty in producing the canes.